Surface rupture: single straight break along the Superstition Hills Fault.
Surface rupture: compression ridge connecting two left-stepping echelon cracks. The ridge consists of arched clods of delicately cemented soil a few millimeters thick. The axis of the arch parallels the ruler.
Surface rupture: area along a single straight break along the Superstition Hills Fault shown in photo jce00017. This photograph shows 7 millimeters of right slip.
North-south-trending crack in the sixth floor just east of the first interior row of columns (from the east face) of the Imperial County Services Building in El Centro.
Scarp at the boundary of a trough feature at site 18 west of Orchard Road (location shown on Plate 1, Professional paper 1254), caused by the settlement of fill over a buried drain line.
Ground-failure effects at site 17 near the intersection of King Road and Orchard Road (location shown on Plate 1, Professional paper 1254). Overlapped canal lining near the east end of the disturbed zone. Note the sand boil on the bottom of the canal.